Screw tightening apparatus

Details Screw tightening apparatus Screw tightening apparatus

1994-01-13

1995-11-28

Payer, Hwei Siu

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

29407, B23Q 500, E21C 500

Patent

active

054699240

ABSTRACT:
A screw tightening apparaus of type including an electric screwdriver the bit shaft of which is arranged to carry a male screw engaged therewith to be threaded into a mounting hole of a workpiece and a drive mechanism arranged to move the screwdriver toward and away from the mounting hole of the workpiece, wherein the screwdriver and drive mechanism are controlled in such a manner that the bit shaft is driven at a low speed and applied with a small thrust force at an initial stage during which the male screw is located to be engaged with the mounting hole, that the bit shaft is driven at a higher speed than that at the initial stage and applied with a larger thrust force than that at the initial stage at an interim stage during which the male screw is threaded into the mounting hole and that the bit shaft is driven at a lower speed than that at the initial stage and applied with a larger thrust force than that at the interim stage at a final stage during which the male screw is tightened and seated on the workpiece.

REFERENCES:
patent: 4908926 (1990-03-01), Takeshima et al.
patent: 5215270 (1993-06-01), Udocon et al.

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